Might be a little off topic
This is a little off topic but I have wondered if anyone has gone through and done a thermodynamic efficiency table for any cartridges. I was thinking you could get the Pressure/volume curves and find the work energy performed by the expanding gasses in the barrel. Then get the muzzle energy from muzzle velocity and bullet mass to get a general thermodynamic efficiency from the two. Say a 30/06 with a muzzle energy of 3800J and you calculated the P/V integral at say 5000J you would have and efficiency of 76% the rest being lost by heat absorption and other means. Granted this would only be usable in internal ballistic comparisons. You could also potentially calculate barrel heating if you had the mass and heat capacity of the barrel metal.
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